Seth Rogen opened up on Capitol Hill Wednesday about a surprising subject: Alzheimer's Disease.The actor — known primarily for playing stoner characters in movies like "Knocked Up" and "Pineapple Express" — spoke at a Senate committee hearing about his mother-in-law's battle with the disease in a speech the was equally passionate and laugh-out-loud funny."First, I should answer the question I assume many of you are asking: Yes, I'm aware this has nothing to do with the legalization of marijuana," Rogen ...